High
sos, sosreport — security advisory
A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.
- Products
- sos, sosreport
- Affected versions
- 3.0-1, 3.1-1, 3.1-1ubuntu1, 3.1-1ubuntu2, 3.1-1ubuntu2.1, 3.1-1ubuntu2.2, 3.2+git276-g7da50d6-1, 3.2+git276-g7da50d6-2, 3.2+git276-g7da50d6-3, 3.2+git276-g7da50d6-3build1, 3.2+git276-g7da50d6-3ubuntu1, 3.2-2ubuntu1, 3.4-1, 3.4-1~ubuntu14.04.1, 3.4-1~ubuntu16.04.1, 3.5-1, 3.5-1ubuntu1, 3.5-1ubuntu2, 3.5-1ubuntu3, 3.5-1ubuntu3.18.04.1, 3.5-1~ubuntu14.04.2, 3.5-1~ubuntu14.04.3, 3.5-1~ubuntu14.04.3+esm1, 3.5-1~ubuntu16.04.2, 3.5-1~ubuntu16.04.3, 3.6-1ubuntu0.16.04.2, 3.6-1ubuntu0.16.04.3, 3.6-1ubuntu0.16.04.4, 3.6-1ubuntu0.18.04.2, 3.6-1ubuntu0.18.04.3, 3.6-1ubuntu0.18.04.4, 3.6-1ubuntu3, 3.8-1ubuntu1, 3.8-1ubuntu2, 3.8-1ubuntu3, 3.9-1ubuntu0.16.04.1, 3.9-1ubuntu0.16.04.2, 3.9-1ubuntu0.18.04.1, 3.9-1ubuntu0.18.04.2, 3.9-1ubuntu0.18.04.3, 3.9-1ubuntu1, 3.9-1ubuntu2, 3.9-1ubuntu2.1, 3.9.1-1ubuntu0.16.04.1, 3.9.1-1ubuntu0.16.04.2, 3.9.1-1ubuntu0.16.04.2+esm1, 3.9.1-1ubuntu0.18.04.1, 3.9.1-1ubuntu0.18.04.2, 3.9.1-1ubuntu0.18.04.3, 3.9.1-1ubuntu0.20.04.1, 3.9.1-1ubuntu0.20.04.2, 4.0-1~ubuntu0.20.04.1, 4.0-1~ubuntu0.20.04.2, 4.0-1~ubuntu0.20.04.3, 4.1-1ubuntu0.18.04.1, 4.1-1ubuntu0.18.04.2, 4.1-1ubuntu0.18.04.3, 4.1-1ubuntu0.20.04.1, 4.1-1ubuntu0.20.04.2, 4.1-1ubuntu0.20.04.3, 4.1-1ubuntu2, 4.1-1ubuntu3, 4.10.0-1, 4.10.1-1, 4.10.2-0ubuntu0~22.04.1, 4.10.2-0ubuntu0~24.04.1, 4.10.2-1, 4.11.1-0ubuntu0.20.04.1~esm1, 4.11.1-2, 4.11.2-0ubuntu0.1, 4.11.2-0ubuntu0~22.04.1, 4.11.2-0ubuntu0~24.04.1, 4.11.2-1, 4.2-1ubuntu0.20.04.1, 4.2-1ubuntu2, 4.3-1ubuntu0.18.04.1, 4.3-1ubuntu0.18.04.2, 4.3-1ubuntu0.20.04.1, 4.3-1ubuntu0.20.04.2, 4.3-1ubuntu1, 4.3-1ubuntu2, 4.3-1ubuntu2.1, 4.4-1ubuntu0.18.04.1, 4.4-1ubuntu0.18.04.3, 4.4-1ubuntu0.20.04.1, 4.4-1ubuntu1.22.04.1, 4.5.6-0ubuntu1~20.04.1, 4.5.6-0ubuntu1~20.04.2, 4.5.6-0ubuntu1~22.04.1, 4.5.6-0ubuntu1~22.04.2, 4.5.6-0ubuntu2, 4.5.6-0ubuntu4, 4.7.2-0ubuntu1~20.04.1, 4.7.2-0ubuntu1~20.04.2, 4.7.2-0ubuntu1~22.04.1, 4.7.2-0ubuntu1~22.04.2, 4.7.2-0ubuntu1~24.04.1, 4.7.2-0ubuntu1~24.04.2, 4.8.2-0ubuntu0~18.04.1~esm1, 4.8.2-0ubuntu0~20.04.1, 4.8.2-0ubuntu0~22.04.1, 4.8.2-0ubuntu0~22.04.2, 4.8.2-0ubuntu0~24.04.1, 4.8.2-0ubuntu0~24.04.2, 4.9.2-0ubuntu0~22.04.1, 4.9.2-0ubuntu0~24.04.1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-79655
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 19:52 UTC · Revision 1
Source evidence
A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.
osv:UBUNTU-CVE-2026-79655
sosreport
Fixed versions: Not specified
sosreport
Fixed versions: Not specified
sosreport
Fixed versions: Not specified
sosreport
Fixed versions: Not specified
sosreport
Fixed versions: Not specified
sosreport
Fixed versions: Not specified
sos
Fixed versions: Not specified
sos
Fixed versions: Not specified
Complete source record
{
"id": "d4db6dea3195fdd11a15bcefcbc0ec0d218579b3fa72d80105679b3dc2f74be8",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-79655",
"method": "structured",
"payload": {
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"title": "UBUNTU-CVE-2026-79655",
"summary": "A flaw was found in sos clean, a utility within the sos package. This vulnerability allows a local attacker to perform arbitrary file creation or overwrite. By crafting a malicious tar archive, an attacker can exploit a path traversal issue during tar extraction, where symlink and hardlink targets are not properly validated. This enables the attacker to write files to arbitrary locations on the system with the privileges of the sos clean process, which often runs as root.",
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],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-79655",
"aliases": [
"UBUNTU-CVE-2026-79655"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
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{
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"events": [
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}
]
}
],
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},
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],
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},
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],
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},
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},
{
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],
"modified": "2026-10-22T23:20:46.378911554Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-79655",
"https://www.cve.org/CVERecord?id=CVE-2026-79655"
]
},
"related_cves": [
{
"value": "CVE-2026-79655",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 410133,
"published_at": "2026-08-25T14:16:00+00:00"
}